<template>
  <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose"
    :collapse="isCollapse" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
    <h3>{{isCollapse ? '后台':'通用后台管理系统'}}</h3>
    <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{item.label}}</span>
    </el-menu-item>
    <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{item.label}}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.name">
        <el-menu-item @click="clickMenu(subItem)" :index="subItem.name">{{subItem.label}}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>

<style lang="less" scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }

  .el-menu {
    height: 100vh;

    h3 {
      color: #fff;
      text-align: center;
      line-height: 48px;
      font-size: 16px;
    }
  }

</style>

<script>
import Cookie from 'js-cookie'
  export default {
    data() {
      return {};
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      //点击菜单
      clickMenu(item) {
        console.log(item)
        //当前页面的路由与跳转的路由不一致才允许跳转
        if (this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))) {
          this.$router.push(item.path)
        }
        this.$store.commit('selectMenu',item)
      }
    },
    computed: {
      //没有子菜单的
      noChildren() {
        return this.menuData.filter(item => !item.children)
      },
      //有子菜单的
      hasChildren() {
        return this.menuData.filter(item => item.children)
      },
      menuData(){
        //判断当前数据，如果缓存中没有，当前store中获取
        return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
      },
      isCollapse(){
        return this.$store.state.tab.isCollapse
      }
    }
  };
</script>

<style lang="less" scoped>
.el-menu{
  border-right:none;
}
</style>